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fkwIts rare enough to find a 2.5" by 3.5" PreWar card but your asking alot for a color photo one.
I dont think any color photo cards (ie 1957+ Topps) exist for before 1941 in any size.
They are either B&W (T209-2, R314), color tinted B&W (R312, W711-1), artist rendition made from a photo (ie T206, T227, Cracker Jack), or hand drawn (W514).
The oldest color photo card I can think of is the 1948 Signal Oil Oakland Oaks set. Any older than that?